The muffler does not need to be very big.

I would also suggest finding someone who has a stack of dead mowers. The tip, scrap metal yard, mower shop, etc.


Some of the later Briggs mufflers (bolt on box shaped ones) could be suitable and have different types of heat shields depending on application. To mount them you would need the tubing from the head to where it needs to sit. Then a flange welded to the tube. Would be easy to make out of a bit of flat plate, hole in the centre and two bolt holes tapped either side for the bolts to hold the muffler on.
Heres one thats for sale in the store on the site here. Suits 4-8HP Briggs.
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And theres one that looks pretty slimilar but bigger for the larger motors.
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Suziki 2 strokes and also the Tecumseh motors could be another source. Not sure how the 2 stroke one would go. You basically just want something that will either go in your heat shield or comes with its own.

Youve got the idea and the shape of the old one in your head, its just a case of eyballing it and going 'thats the one, i can make it work'


Thats good about the tank. Are they the same mounting bolt pattern???

Cheers, Bob.